ubuntu 14.04 安装ntp
安装
sudo apt-get install ntp
修改ntp.conf配置文件
sudo vi /etc/ntp.conf
修改为如下内容
# Enable this if you want statistics to be logged. #statsdir /var/log/ntpstats/ #也可以开启NTP log statistics loopstats peerstats clockstats filegen loopstats file loopstats type day enable filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable # Specify one or more NTP servers. # Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board # on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for # more information. server 120.24.166.46 # 阿里云NTP Server----------- server 127.127.1.0 # 如果公网NTP不可用时，将使用Local时间作为NTP服务提供给NTP Client。 # Use Ubuntu's ntp server as a fallback. server ntp.ubuntu.com # Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for # details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions> # might also be helpful. # # Note that "restrict" applies to both servers and clients, so a configuration # that might be intended to block requests from certain clients could also end # up blocking replies from your own upstream servers. # By default, exchange time with everybody, but don't allow configuration. restrict -4 default kod notrap nomodify nopeer noquery restrict -6 default kod notrap nomodify nopeer noquery restrict 192.168.20.0 mask 255.255.255.0 nomodify # 允许的NTP Client网段--------------- # Local users may interrogate the ntp server more closely. restrict 127.0.0.1 restrict ::1
重启NTP服务，并在客户端验证
root@ntpserver:~/ceph-cluster# service ntp restart * Stopping NTP server ntpd [ OK ] * Starting NTP server ntpd [ OK ] root@ntpclient:/etc/ceph# ntpdate ntpserver 14 Jan 10:55:51 ntpdate[5230]: adjust time server 192.168.20.177 offset 0.209691 sec root@ntpclient:/etc/ceph#
观察时间同步状况：
ntpq -p
remote：本机和上层ntp的ip或主机名，“+”表示优先，“*”表示次优先
refid：参考上一层ntp主机地址
st：stratum阶层
when：多少秒前曾经同步过时间
poll：下次更新在多少秒后
reach：已经向上层ntp服务器要求更新的次数
delay：网络延迟
offset：时间补偿
jitter：系统时间与bios时间差
查看ntpd进程的状态
【命令】watch "ntpq -p"
第一列中的字符指示源的质量。星号 ( * ) 表示该源是当前引用。
remote：列出源的 IP 地址或主机名。
when：指出从轮询源开始已过去的时间（秒）。
poll：指出轮询间隔时间。该值会根据本地时钟的精度相应增加。
reach：是一个八进制数字，指出源的可存取性。值 377 表示源已应答了前八个连续轮询。
offset：是源时钟与本地时钟的时间差（毫秒）。
设置开机启动
chkconfig ntpd on
参考：
https://www.cnblogs.com/vincenshen/p/6284933.html
https://blog.csdn.net/willinge/article/details/79928726
https://www.cnblogs.com/quchunhui/p/7658853.html
https://blog.csdn.net/jinyuxiaoqiang/article/details/81634827
https://www.cnblogs.com/quchunhui/p/7658853.html
